Plaster-key.



U. B. GOMSTOOK. PLASTER KEY. APPLICATION FILED JUNE 26, 1911.

Patented Jan. 20, 1914.

"U gil fii lihtd @FFIOE.

I CURRY IS. COIVISTOCK, OF NEW YORK, N. Y.

PLASTEB-KEY.

Application filed June 26, 1911.

1 all 1071 am it may concern Be itknown that l. Conny B. Cons'roeit, a citizen of the United States, residing" at. New York. in the county of New York and F t-ate of New York, have invented certain new and useful Improvements in llaster- Keys. of which the following is a specification. reference being had therein to the accompanying; drawing.

This invention relates to devices for interlocking layers of materials such as concrete and plaster.

l v 'hilc the primary object of the invention is to provide keys which may he enil'iedded in a concrete wall or ceiling and thereby provide recesses within which plaster or other facing" material may be pressed to securely hold it in contact. with theconcrete. it may also he used in other ways for joining two plastic substances.

Referring to the drawings: Figure l is a side elevation. Fig. 2 shows two vertical transverse sections. one on the line a.a and the other on the line -42 of Fig. 1.' Fig. 3 is an end elevation. Fig". dis an inverted plan view. Fig. 5 is a cross section take through a concrete floor, on the under side of which plaster has been attached by means ,oi the device. 6 is a plan view showing several of the elements placed upon the inner surface or a mold ready to receive the Q concrete. Fig. t is a PEISPGCHVQ view o1 an end of the device in a modified form.

In the dra vings, the numeral 1 indicates. in general, a long tube-like piece oi? metal or other suitable material h vinp' an approximately three-quarter circular cross section with a longitudinal slot 2. The material is formed outward from the eds s 3 ot the opening 2 into wings or tlan es 4-. These flanges are in substantially the same plane and are perpendicular to a plane passed through "the center of the opening 2 and diametrically through thetuhular circula portion 1.

An economical way to manufacture this plaster key, as it may he termed, is to form long strips with this approximately threequarter circular winged cross section and shear oft pieces of a desired length. The shearing process will close the ends of the tubular strips and .g;ive it substantially the form shown in Fig. 3. The flanges are of sufiicient area to form a stable lease portion and will maintain the pieces in an upright position with the opening downward.

Specification of Letters Patent.

PatentedJan. Serial No. 635,346. f:

Fig. 7 illustrates a modi' fition in which a corner of the flange is'loent downward a right angles forming a-point 5 whichgmflyly he driven into a wooden mold andthereb retaining the key in any positionin whicliiitr is placed. This facilitates placing; the key upon an inner surface of a vertical molds: such as is used in forming a wall and'pprovents their displacement when the concrete. is forced intothc mold. w

Figs. 5 and .6 illustrate the manner. which the keys are used in securing "they plaster to a concrete w-allcr ceiling- The l keys are first placed upon the mold with the flanges contacting with the surface of the'niold which will later be replaced by plaster other covering material. The concrete then run in and (amped and after a suitable time has elapsed the wooden mold is torn away. The result is that the surface now presents a multiplicity of slots or openings into which the plaster will be forced and consequently key it in place and thereby be prevented from displacement. The ends. of the keys are closed in the shearing process so as to prevent concrete from running in at. the ends and occupying space which the plaster is later to fill.

What I claim is:

1. A key for securing one layer of plastic material to another consisting of an isolated short tubular section having slot of a width less than the width of the tubular section and extending from end to end. there- 90 of and wings extending outward from the edges of the slot and in the same plane.

A. key for securing one layer of plastic material to another consisting of a short tubular section provided with a slot of 3/9 width less than the width of the tubular section and extending from end to end thereof, (he said section having its walls pinched together at each end forming a chamber.

A key for securing one layer of plastic 9 material to another consisting of an isolated short tubular section provided with a slot of a width less than the width of the tubular section and extending I. omend to end thereof, wings extending outward from the-edges i ing of a tubular element provided with :a' 119:. I

longitudinal opening amhclosd at its ends; flanges formed outward from the edges ofthe opening; and pointed projections formed vfrom said wings at approximately 90 thereto, t, 1 v

5. A device of the class described consisting ofa strip of material so formed that it has an approximate'three-quarter circular cross section with the edges of the circular portion extended outward to form wings "located in substantially the same plane, and

pointed projections formed fromsaid wings downward at approximately 90 thereto.

center of the opening and diametrical to the tubular portion, and pointed projections extending downward from said Wings at approximately 90".

7. A. device of the class described consisting of a hollow element provided with a longitudinal opening, the edges formed by said opening formed outward into wings located in substantially the same plane, and projec tions formed downward from said Wings.

In testimony whereof I aflix my signature,

in presence of two witnesses.

GORRY BL COMSTOCK.

Witnesses:

VV. FENN,

G. R. F ENNIMORE. 

